Grinding-machine



W. G. STEVENSON.

GRINDING MACHINE.

APPLICATION FILED on. 5. 191a.

Patented Sept. 23, 1919 3 SHEETS-SHEET I- 'rul: comma PLANUGRAIII Cm. wumwn W. G. STEVENSON.

GRINDING MACHINE.

APi ucAnoN FILED 001.5. ms

PatentedSept 23, 1919.

3 SHEETS-SHEET 2.

I v 25 7 wmg kvgmon By W W w run COLUMBIA PLANOGIIAPH c0.. wAsmun-rm: n. c,

W. G. STEVENSON.

cmomc MACHINE. APPLICATION FILED OCT. 5. ISIB.

Patented Sept. 23, 1 919.

3 SHEETS-SHEET 3- [wander Wm JZevenaon y M .WILLIAM G. STEVENSON, OF CHICAGO, ILLINOIS.

GRINDING-MACHINE.

Specification of Letters Patent.

Patented Sept. 23, 1919.

Application filed October 5, 1918. Serial No 256,944.

To all whom it may concern:

Be it known that I, WILLIAM G. STEVEN- SON, a citizen of the United States, and a resident of Chicago, in the county of Cook and State of Illinois, have invented certain most important features being emptying or unloading mechanism which is particularly adaptable when the material ground is moist or wet.

A machine embodying the various features of my invention is shown on the accompanying drawings, in which- Figure 1 is a side elevational view, partly in section and broken away,

Fig. 2 is a sectional view on plane 2-2, Fig. 1, and

Fig. 3 is a plan view of the machine with the upper part removed.

A supporting structure 5, preferably of concrete, provides the pit 6 which is spanned over by a supporting frame 7. This frame has the vertical centralextension 8 forming a bearing housing for the vertical shaft 9. Within the housing the shaft has the bearing hub 10 secured thereto and engaging with the bearing ledge 11 which is preferably surfaced with Babbitt metal 12. The upper end of the shaft extends into the upper end of the housing and the lower end is keyed to the hub 13 of the circular grinding table 14. Secured to the under side of this grinding table is the gear 15 with which meshes the pinion 16 at the lower end of the shaft 17 which is journaled at its lower end in the bearing frame 18 and at its upper end in the housing 19 of a suitable driving motor whose shaft 20 carries the gear pinion 2-1 meshing with the gear 22 p on the shaft 17.

The grinding table 14 supports the annular grinding plate 23 and the cylindrical wall 24 held in place between the grinding plate and the peripheral flange 25 on the table. The grinding plate is engaged by the grinding rollers 26 and 27, these rollers being diametrally opposite and each pivoted on a shaft 28. Each shaft is fiat-sided at its ends from which extend the lugs 29 and 30 respectively, which engage in the vertical slots 31 of opposed guide plates 32 supported in the housings 33 forming part of the frame 7, protecting caps 34 and 35 being provided for the respective rollers. The rollers are thus vertically shiftable as material is carried between them and the grinding plate.

Secured to the under side of the frame 7 by screws 36 is the conical frame 37, this frame being concentric with the shaft 9 and of a diameter to bring it into register with the inner edge of the grinding plate 23, and this frame forms with the cylindrical wall 24 and the plate an annular chamber or passageway C for the material which is being ground. The hub 13 has the vertical passageways 3.8 therethrough and at one side has the outlet opening 39. A gate 40 is secured to the shaft 41 to be swung to open or close the passageway 39, the inner face of the door being arcuate to register with the inner face of the frame 37 when it is closed. Below the outlet passageways 38 is supported the funnel 42 for discharging ground material to the conveyer belt 43.

A charging spout 44 for material to be ground projects through the opening 45 in the frame 7, the material flowing through the opening 46 in the base of the frame and into the chamber G, the material being deposited in advance of the roller 27. Suspended from the frame 7 is a bracket 47 which supports the mixing and deflecting plate 48, this plate engaging diagonally across the outer part of the plate 23 opposite the outer end of the gate 40 so that material will be deflected by the plate inwardly toward the outlet opening 39, the turn table rotating in the directionindicated by the arrow in Fig. 3. Diametrically opposite a similar plate 49 is supported by a bracket 50 extending from the frame 7, this plate also extending diagonally from the outer edge of the grinding plate toward the inner part thereof. Secured to the frame 37 opposite the Plate 49 is another deflector plate 51 which extends diagonally a distance over the grinding plate from the frame 37.

The mechanism for controlling the setting of the gate 40 is clearly shown in Figs. 1 and 2. The vertical shaft 41 to which the gate is secured is journaled in the frame 39 and has secured to its upper end the arm 52. On the end of this arm is mounted the bracket 53 to which and the arm the nut 54 is trunnioned by pins 55 and 56.

a The shaft 57 threads at itainner end i through thenut and is journaledat itsouter i end in the-bearing frame 58 which is ro- V V tl'reex'act eoneaueuon and varrangement shown and described jaschanges andmodifi-s cations' are no doubt possible'which would tatably' mounted on "the franue i-"by'-tr'hearis of the stemj59. Thehand wheel 60 ispro- 'vided for the shaft and when it""i's turned" ,the' shaft, by its'engagement with the hut 54,'will cause swing of the arm- 52 and corresponding swing of the gate 40tocontrol the outlet 39; a V Describing the oper'ation, the material to vbe g u na isfed into the chainb'er cin m 7 pr one of the rollers 27 1and is rledby thelgrinding table below and past the roller where it: isground. vThe grindi ingtablerotates quite rapidly and centrifujgal force will throw the material outwardly.

,NVhen the material; reaches the deflector plate is it is shifted inwardly and thereby stirred up aiid' inixed; The inwardly de-Y flected. material willistlrike the gate lO when is closed and the outer side of'this gate s cuir ved s'o'iastoj guide and-deflect the ma- 30V 7 position shown in dotted lines, Fig.3,a'nd

} pate-4s through the outlet B9,,the material falling through the passageways 38 into the if iin'nel 42 and. to the belt 43 to be con 'yeyed away. The rate of discharge from the machine can be controlled by ope'ning terial outwardly to cause further agitation and mixing-thereof. The material i's now acted upon by theroller 26 and then reaches the plate 49; which it is deflected inwardlypthej plate 51 then shifting it outwardly. After the materim has'been sufli,

'ci'ently ground the gate is opened to the the material will f'then be deflete'd ,by the the .gatejte any degree.. 7 1

' With nay-improved diech rgin armngemerit the grinding machine can be quickly ahd 'elfie'lentl'y unloaded; It is particularly r effic ent when thetreatedwin'aterial is'inoist For; stieky, the deflector plates positively shifting and forcing the material through the outlet. the. insideof the grinding table is also Very desirable and important as there isno pres- 3;

usu-re,ezierted-on; the closed gate and'conseque u no leakage Past the 'gate; j In prior structures the material outlet and itsgcl'o- 'fsure ineansare inthe path of themateri'al The location ofthe outlet at V 7 images erfthisimt nt iiieyi elo'btaineii tor-five tents eat h by'ad I claim as follows:

an the te a e pressure meat 5 and leakage is apt to occur.

I do not of course desire'to be limited to 'still come within thescope of the invention.

1. In a grinding machine, the eornbinaretainingwall forsaid table, an lnner wall stationarily supported 1 to surround the pea eel person er said tabl said central po tion having. 7 discharge assageway therethrough, rollers {engaging with said table; V

bet-ween said' wallsysaid inner-wallhaving '7 V gate wayyafgate'for 'contfollingsai'd gate' 7 "way, deflector plates tor'deflecting fiaterial' r inwardly 'on' said, table, said gate when closed acting" to'de flect material away from -saidinn'er walland outwardly on said t'a'ble when, open; "a oti'ng t'o deflect and guide material through aid gate way and to said discharge passageway. i

,2. In agrinding maohineg the coinbina tion'o'lf a rotatabl'egrinding table, an outer retainingwa-ll for saidtable, an inner wall 7' v V stationarily supportedto'surrou'nd the oeni tral portion of said table, said centralpor tion having a discharge, passageway ,th'ere through, rollers engaging with said table ;.between said walls, said inner'wallhaving a gate way, agate for controlling-said gate 7 way, saidgate beingpiyoted-at one end to swinghorizontal ly,-a deflector 'pl'ate statiom J arily mounted over saidgrindlng table for .plefiecting' material inwardly on 'said table toward the free end of said gate, said gate i whenc'losed causing deflection of the material 'aw'ay from s aidinnerwall'tand ou t wardly on said tablegsaid v"gate when. open forming a continuation; of said deflector. a V '1 plate whereby niate'rialisi deflected along sa'idi'deflector plate and said "Fgat'e through sageway. r it 5 a said gate way and to said ;discharge. pass:

In"witness whereof I hereunto subscribe V tiny name this 30th day of S eptember A; D. I

:LW ILLIAM STEVENSON, I K V dressing the commission'erfof l'ateiltshj Q 'fl: was ingtqn,rn. c. 

